Find helpful customer reviews and review ratings for Woods 7-Day Indoor Digital Lighting Timer DT300 (2-Pack) at Amazon.com. Read honest and unbiased 4,204,250 May 20 , 1980 United States Patent ( 19 ) Woods et al . CLOCK LOGIC 123 BUS 48 - R DT 25 50 LINK CONTROL P1 51 P2 TEST 27 LOGIC INTERNAL BUS JOSEPH DEP that he continues to give INSTRUCTION in SINGING and the PIANOFORTE Ph . D. , A.M. , L.L.D. , D.D. , D.T. , or M.D. - Address ( pre - paid )